How To Make An Igloo

Step
2.Form a circle with blocks around
the hole created where you cut the blocks. Cut the circle in a spiral from
the top of the last block to the ground ahead of the first block. This
will make it easy to construct a dome.

.

Step
3.Build up walls, overlapping the
blocks and shaping them so that they lean inward. Cut a hole under the
wall for the cold sink and entrance. Put several blocks along one wall
as a sleeping platform

.

Step
4. The last block must initially be larger than the hole. Place
the block on top of the igloo, then, from inside, shape and wiggle it to
slot exactly into the hole

Step
5. Hot air from your body and stove rises and is trapped inside
the dome. Cold air falls into the sink and flows away to the outside. It
is essential to cut ventilation holes in the walls with an ice axe.

Finished
Igloo

With warmth inside
the igloo, the surface of the walls will melt and freeze over, to form
a smooth, airtight ice surface. The roof over entrance tunnel prevents
snow from blowing into igloo.

WARNING! It
is vital to make at least one airhole in the roof to avoid suffocation.
The igloo will get very warm inside with heat from your body, even if it
is cold and windy outside. Without ventilation, lethal carbon dioxide will
build up. Also, the use of stoves in an enclosed shelter is not recommended
due to dangerous build-up of carbon monoxide.

The
following is reprinted from"The Complete Wilderness
Training Guide" written by Hugh McManners
and published by Dorling
Kindersley.